chore(travis): add Node8, drop Node5 and Node7

twada · twada · commit 33e36bdba4d1 · 2017-10-11T17:52:11.000+09:00
diff --git a/.travis.yml b/.travis.yml
@@ -2,6 +2,5 @@ language: node_js
 sudo: false
 node_js:
   - "4"
-  - "5"
   - "6"
-  - "7"
+  - "8"
